JP4066580B2 - Method for measuring the concentration of residual dispersant - Google Patents
Method for measuring the concentration of residual dispersant Download PDFInfo
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- JP4066580B2 JP4066580B2 JP33783399A JP33783399A JP4066580B2 JP 4066580 B2 JP4066580 B2 JP 4066580B2 JP 33783399 A JP33783399 A JP 33783399A JP 33783399 A JP33783399 A JP 33783399A JP 4066580 B2 JP4066580 B2 JP 4066580B2
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- dispersant
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Description
【０００１】
【発明の属する技術分野】
この発明は、ボイラ給水に添加された分散剤が硬度成分をマスキングした後に残留する残留分散剤の濃度を測定する方法に関する。
【０００２】
【従来の技術】
従来、たとえばボイラ給水には、スケール防止のために、硬度成分をマスキングする目的でＥＤＴＡ（エチレンジアミンテトラアセテート）等の分散剤が注入されている。しかしながら、給水中の分散剤の濃度を検知することは、行われていなかった。そのため、ボイラ給水への分散剤の投入量が適正かどうか確認することができなかった。そこで、硬度成分をマスキングした後に残留する分散剤の残留量が適正であるかどうか検知する方法が求められている。
【０００３】
【発明が解決しようとする課題】
この発明は、前記問題に鑑み、特定の割合で分散剤とキレートを形成する金属イオンおよび金属指示薬とを含む滴定液でボイラ給水を滴定し、発色の差で検知が可能な残留分散剤の濃度測定方法を提供することを目的としている。
【０００４】
この発明は、前記課題を解決するためになされたものであって、請求項１に記載の発明は、ボイラ給水に添加された分散剤が硬度成分をマスキングした後に残留する残留分散剤の濃度を測定する方法であって、分散剤が添加されたボイラ給水から採取した被測定溶液に対して分散剤とキレートを形成する金属イオンおよび金属指示薬を含む滴定液を滴下し、金属指示薬の発色が変化するまでに滴下した滴定液中の金属イオンの量に基づいて残留分散剤の濃度を判断することを特徴としている。
【０００５】
【発明の実施の形態】
つぎに、この発明の実施の形態について説明する。この発明は、被測定溶液，たとえばボイラへの給水の残留分散剤の濃度を検知するのに好適に実施することができる。この発明における分散剤の添加は、スケール生成を引き起こす成分である硬度成分を完全にマスキングするためであり、分散剤のキレート効果により硬度成分をマスキングすることができるからである。この発明における分散剤として、ＥＤＴＡ（エチレンジアミンテトラアセテート），ＮＴＡ（ニトリロ三酢酸）等が適用される。
【０００６】
また、この発明における残留分散剤の濃度を測定する滴定液の主成分として、分散剤とキレートを形成する金属イオンが適用される。この金属イオンを用いる利点として、残留分散剤と反応させることにより、消費された金属イオンの量で残留分散剤の濃度を求めることができるからである。この発明における金属イオンとして、アルカリ土類金属または遷移金属等が適用される。
【０００７】
さらに、前記残留分散剤と金属イオンの反応を色の変化で判断するために、滴定液には金属指示薬が含有される。この金属指示薬を用いる利点として、この金属指示薬は、前記残留分散剤の濃度を前記金属イオンを含む滴定液で滴定するときに発色色素として有効に使用することができるからである。この発明における金属指示薬として、カルマガイト，ＥＢＴ（エリオクロムブラックＴ），ＮＡＮＡ（１−２−ヒドロキシ−４−スルホ−１−ナフチルアゾ−２−ヒドロキシ−３−ナフトエ酸）等が適用される。
【０００８】
【実施例】
つぎに、この発明の具体的実施例を詳細に説明する。まず、この発明における分散剤について説明する。前記分散剤の具体例として、ＥＤＴＡについて説明する。このＥＤＴＡは、６座配位子として金属イオンに配位し、１：１の水溶性のキレート化合物を生成する。これにより、残留ＥＤＴＡの量とそれに配位した金属イオンの量が当量であることが分かり、配位した金属イオンの量を求めることで、残留ＥＤＴＡの量が分かる。
【０００９】
また、前記分散剤と前記金属イオンが２：１のキレート化合物を生成するものの例として、エチレンジアミンと銅イオン（II）の組合わせ等がある。
【００１０】
さらに、前記分散剤と前記金属イオンが３：１のキレート化合物を生成するものの例として、エチレンジアミンとコバルト（II）イオンの組合わせ等がある。
【００１１】
前記したように、分散剤と金属イオンの配位比が安定していて一定であれば、前記金属イオンの消費量から前記分散剤の残留濃度を求めることができる。
【００１２】
そこで、この発明における金属イオンについて説明する。この金属イオンは、前記分散剤と特定の割合でキレートを形成する必要がある。そのため、これを満たす前記金属イオンとして、アルカリ土類金属や遷移金属等がある。前記金属イオンの具体例として、マグネシウムについて説明する。前記マグネシウムは、アルカリ金属と比べてイオン性が弱く、分散剤とキレートを生成しやすくなっている。また、前記分散剤に配合する割合が安定して一定である。そのため、前記マグネシウムが残留分散剤の濃度測定に適した金属イオンであることが分かる。
【００１３】
しかし、分散剤，金属イオンおよびキレート化合物は、どれも無色であるため、それだけでは色の変化で判断することができない。そこで、色の変化で判断できるようにするために、金属指示薬を必要としている。この金属指示薬の具体例として、カルマガイトについて説明する。前記カルマガイトは、金属イオン，すなわちマグネシウムイオン，カルシウムイオン，亜鉛イオン，鉛イオン，カドミニウムイオン等と錯イオンを形成し、赤色から青色に変化することで検知するようになっている。
【００１４】
すなわち、前記金属指示薬の性質を利用して、前記残留分散剤と前記金属イオンがキレートを生成し、前記残留分散剤がすべてキレートとして生成されると、つぎに金属イオンと金属指示薬が錯イオンを形成することで色が変化する。それにより、前記分散剤がすべてキレートとして変化したことが分かり、それまでに滴下した滴定液中の金属イオンの量により残留分散剤の濃度を判断することができる。
【００１５】
【発明の効果】
以上のように、この発明によれば、分散剤の投入量が適正か否かを判断することができる。すなわち、この発明によれば、分散剤の投入量の過不足を調整することにより、必要最小限の投入量とすることができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for measuring the concentration of residual dispersant remaining after a dispersant added to boiler feed water masks the hardness component .
[0002]
[Prior art]
Conventionally, for example, in boiler feed water , a dispersant such as EDTA (ethylenediaminetetraacetate) has been injected for the purpose of masking hardness components in order to prevent scale. However, the concentration of the dispersant in the feed water has not been detected. For this reason, it has not been possible to confirm whether the amount of the dispersant added to the boiler feed water is appropriate. Therefore, there is a demand for a method for detecting whether or not the residual amount of the dispersant remaining after masking the hardness component is appropriate.
[0003]
[Problems to be solved by the invention]
In view of the above-mentioned problem, the present invention titrates boiler feedwater with a titrant containing a metal ion and a metal indicator that form a chelate with a dispersant at a specific ratio, and the concentration of the residual dispersant that can be detected by the difference in color development The purpose is to provide a measurement method.
[0004]
The present invention has been made to solve the above-mentioned problems. The invention according to claim 1 is directed to the concentration of the residual dispersant remaining after the dispersant added to the boiler feed water masks the hardness component. A method of measurement, in which a titrant containing a metal ion and a metal indicator that forms a chelate with a dispersant is dropped into a solution to be measured collected from a boiler feed water to which a dispersant is added, and the color of the metal indicator changes It is characterized in that the concentration of the residual dispersant is determined based on the amount of metal ions in the titrant that has been dripped .
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described. The present invention can be suitably implemented to detect the concentration of a residual dispersant in a solution to be measured, for example, water supplied to a boiler. The addition of the dispersant in the invention is to fully mask the hardness component is a component that causes scale formation, because it is possible to mask the hardness components by the chelating effect of the dispersing agent. As the dispersant in the present invention, EDTA (ethylenediaminetetraacetate), NTA (nitrilotriacetic acid) or the like is applied.
[0006]
In addition, metal ions that form a chelate with the dispersant are applied as the main component of the titrant for measuring the concentration of the residual dispersant in the present invention. The advantage of using this metal ion is that the concentration of the residual dispersant can be determined from the amount of consumed metal ions by reacting with the residual dispersant. As the metal ion in the present invention, an alkaline earth metal or a transition metal is applied.
[0007]
Furthermore, in order to determine the reaction of the residual dispersant and metal ions in the color change, the titrant metal indicator is contained. As an advantage of using this metal indicator, this metal indicator can be effectively used as a coloring dye when the concentration of the residual dispersant is titrated with a titrant containing the metal ions. As the metal indicator in the present invention, karmagite, EBT (Eriochrome Black T), NANA (1-2-hydroxy-4-sulfo-1-naphthylazo-2-hydroxy-3-naphthoic acid) and the like are applied.
[0008]
【Example】
Next, specific embodiments of the present invention will be described in detail. First, the dispersing agent in this invention is demonstrated. As a specific example of the dispersant, EDTA will be described. This EDTA coordinates to a metal ion as a hexadentate ligand and generates a 1: 1 water-soluble chelate compound. Thereby, it turns out that the quantity of residual EDTA and the quantity of the metal ion coordinated to it are equivalent, and the quantity of residual EDTA is known by calculating | requiring the quantity of the coordinated metal ion.
[0009]
Moreover, there exists a combination etc. of ethylenediamine and copper ion (II) as an example of what the said dispersing agent and the said metal ion produce | generate a 2: 1 chelate compound.
[0010]
Furthermore, as an example of what the said dispersing agent and the said metal ion produce | generate a 3: 1 chelate compound, there exists a combination etc. of ethylenediamine and a cobalt (II) ion.
[0011]
As described above, if the coordination ratio between the dispersant and the metal ions is stable and constant, the residual concentration of the dispersant can be determined from the consumption amount of the metal ions.
[0012]
Therefore, the metal ions in the present invention will be described. This metal ion needs to form a chelate with the dispersant at a specific ratio. Therefore, examples of the metal ions that satisfy this include alkaline earth metals and transition metals. As a specific example of the metal ion, magnesium will be described. Magnesium is weaker in ionicity than an alkali metal and easily forms a dispersant and a chelate. Moreover, the ratio mix | blended with the said dispersing agent is stable and constant. Therefore, it turns out that the said magnesium is a metal ion suitable for the density | concentration measurement of a residual dispersing agent.
[0013]
However, since the dispersant, the metal ion, and the chelate compound are all colorless, it cannot be judged by color change by itself. Therefore, in order to be able to judge by the change of color, a metal indicator is required. Karmagite will be described as a specific example of this metal indicator. The carmagite forms complex ions with metal ions, that is, magnesium ions, calcium ions, zinc ions, lead ions, cadmium ions, and the like, and is detected by changing from red to blue.
[0014]
That is, utilizing the properties of the metal indicator, the residual dispersant and the metal ion produce a chelate, and when all the residual dispersant is produced as a chelate, the metal ion and the metal indicator then form a complex ion. The color changes by forming. Thereby, it can be seen that all of the dispersant has been changed as a chelate, and the concentration of the residual dispersant can be determined from the amount of metal ions in the titration solution dripped so far.
[0015]
【The invention's effect】
As described above, according to the present invention, it is possible to determine whether or not the input amount of the dispersant is appropriate. That is, according to the present invention, the necessary minimum input amount can be achieved by adjusting the excess or deficiency of the input amount of the dispersant.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33783399A JP4066580B2 (en) | 1999-11-29 | 1999-11-29 | Method for measuring the concentration of residual dispersant |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33783399A JP4066580B2 (en) | 1999-11-29 | 1999-11-29 | Method for measuring the concentration of residual dispersant |
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| Publication Number | Publication Date |
|---|---|
| JP2001153862A JP2001153862A (en) | 2001-06-08 |
| JP4066580B2 true JP4066580B2 (en) | 2008-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33783399A Expired - Lifetime JP4066580B2 (en) | 1999-11-29 | 1999-11-29 | Method for measuring the concentration of residual dispersant |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034726A (en) * | 2013-03-06 | 2014-09-10 | 广东先导稀材股份有限公司 | Method for determining bismuth content and vanadium content of bismuth vanadate |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007263632A (en) | 2006-03-28 | 2007-10-11 | Miura Co Ltd | Method and kit for measuring chelating agent |
| CN104155288B (en) * | 2014-08-08 | 2017-01-18 | 清远先导材料有限公司 | Method for measuring content of constant metal in sample |
-
1999
- 1999-11-29 JP JP33783399A patent/JP4066580B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104034726A (en) * | 2013-03-06 | 2014-09-10 | 广东先导稀材股份有限公司 | Method for determining bismuth content and vanadium content of bismuth vanadate |
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| Publication number | Publication date |
|---|---|
| JP2001153862A (en) | 2001-06-08 |
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